of stuttgart



G. HONOLD.

BATTERY IGNITION FOR INTERNAL COMBUSTION ENGINES. APPLICATION FILED FEB. 6, 1920.

1,377,482; e e May 10, 1921; E

B\/A'ITEI F\N EM I Q 774% X W.

arena? entice.

GOTTLOB HONOLD, F STUTTGABT, GERMANY, ASSIGNQB TO THE FIRM 0F RQBERT BOSCH AKTIENGESELLSCHAFT, 0F STUTTGART, GERMANY.

BATTERY IGNITION FOB, INTERNAL-COMBUSTION ENGINES.

1,3?FAL82.

Application filed February 6, 1920.

1 of which the following is a specification.

The invention relates to battery ignition for internal combustion engines with more than one cylinder. The usual known arrangements in this system comprise, besides the battery, a stationary induction coil with primary and secondary windings, a stationary interrupter, controlled by a rotating cam and a rotating distributer. The high tension ignition current must be taken off from the secondary winding by means of a sliding contact and led to the rotating distributer. A sliding contact of this kind in the high tension lead, however, always involves inconvenience and expense, for all the transmission parts must be carefully insulat d from their surroundings. For that reaso arrangements are known in which the whole coil revolves with the rotating distributer, so that the rotating distributer is directly connected to the secondary coil,

and the sliding contact can be done away with. This known arrangement has, however, in consequence of the rotation of the primary winding, the disadvantage that the low tension current from the battery or from, the stationary interrupter must be led through a sliding contact into the primary winding.

The present invention obviates these disadvantages which occur both with stationar and with rotating induction coils. Accor ing to the invention a battery ignition is provided for multi-cylinder engines in which the primary winding of the coil is stationary while the secondary winding rotates.- By this arrangement the rotating member of the distributer is directly connected to and r0- tates with the secondary winding about the stationary primary winding.

The acompanying drawing shows an example of a construction according to the in:

vention.

The primary winding 0 of the induction coil is fastened to a support a of the station-' ary coil casing by means of thelaminated iron core I); It is surrounded by a hollowshaft d supported in external bearings,'the

Specification of Letters Patent.

Patented May n@, 1921.

Serial No. 356,790.

secondary coil being wound on an extension 6 of the shaft, the extension consisting of a sleeve of insulating material. An interrupter cam h is secured on an extension g ofthe hollow shaft (Z. The contacts of the primary interrupter i are connected, respectively, with the ends of the primary winding, the battery 70 and the cut out switch being placed in the same lead. A sparking electrode m, which is oppositethe segments n of the distributer 0, is secured, for example, to a flange Z of the sleeve 6 and is connected to one end of the secondary wind-- 111g.

The arrangement works as follows :The primary current is-periodically opened and closed by the interrupter so that an ignition current is induced in known manner in the secondary winding. The secondary current is led by the lead 19 to the sparking electrode m and thence through the segments of the distributer to the insulated electrodes of the sparking plugs. From the mass electrode of the plug the current passes to the hollow shaft (Z and thence returns through the lead 1' to the secondary'coil f. The return lead from mass to the hollow shaft may be either through the bearing or, preier-ably, through a small sliding contact (an earthing carbon or the like) which is indica'ted by the spring 8 connected tothe centating member of the distributor with the rotating secondary'coil is that the igniting current can be led to the insulated distributer without a sliding contact and also without an inconvenient insulating device for the high tension current, while the return lead of the ignition current is effected over mass by means of a sliding contact (carbon or the like) requiring no insulation and, therefore, of very simple construction. Since the coupling of the secondary coil is effected with the primary coil electromagnetically and not electrically, there is no objection in the secondary coil rotating about the stationary primary coil if the air space between the two is relatively small. 7

. Having now particularly described and ascertained the nature of my said invention and in what manner the same is to be performed, I declare thatwhat I'claim is 1.: In a battery ignition system for multij cylinder engines, the combination of an induction coil having a stationary primary Winding and a rotatable secondary Winding, and means for rotating said secondary winding.

2. In a battery ignition system for multicylinder engines, the combination of an induction coil, comprising a stationary primary Winding and a rotatable secondary 10 winding, a distributer having a member connected with said secondary winding and rotatable therewith, and means for rotating said distributer member and secondary winding.

In testimony whereof I have aflixed my 15 signature in presence of two witnesses.

GOTTLOB HONOLD. Witnesses ADoLPH LEBHERS, HERMANN SCHNEIDER. 

